in fact, as ktvu's john sasaki reports of almost 1200 at-large offenders violating the tracker mandate, almost a thousand are sex-offenders, and could be in or close to your neighborhood. >> reporter: this page from the department of correction's website may come as a surprise, updated daily shows at-large parolees who bailed on the state's gps monitoring system including many sex-offenders from bay area counties, such as ronny cook from santa clara guilty of sexual battery and this man guilty of child moisturation. >> if you are a sex offender on the loose you are still being looked for. >> reporter: ktvu obtained this whistle- blower letter and sounding the alarm of those who disabled their anklets and could be leaving near minors all in violation of their parole and no one is looking for them. >> you take your ankle monitor off, that is supposed to be the big tool-senate bill 109 was the realignment bill that changed the way the california prison system operates and some argue has removed the ability of state to return sex- offenders to prison for parole violations. >> if you are a